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From: b3300876@rick.cs.ubc.ca (george kai yee chow)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Limitations in recording and playback of digitized audio.
Keywords: audio processing bottlenecks
Message-ID: <1990Oct15.175254.3081@rick.cs.ubc.ca>
Date: 15 Oct 90 17:52:54 GMT
References: <2332@wroach.cactus.org> <1990Oct13.165359.14653@chaos.cs.brandeis.edu>
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Organization: Rick Lab, CPSC, UBC, Vancouver, B.C., Canada
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In article <1990Oct13.165359.14653@chaos.cs.brandeis.edu> dan@chaos.cs.brandeis.edu (Dan Schwarz) writes:
>The Macintosh has no inherent bottlenecks which prevent it from recording
>direct-to-disk or playing back direct-from-disk. Certainly the machines
>equipped with Apple Sound Chips have the potential to do it; machines
>with the Sony Sound Chip (Mac Portable, Mac SE and earlier) may be limited
>to the 22khz sampling rate when doing simultaneous disk operations.
>(When you say "disk" I assume you mean hard disk, not floppy or fileserver.)
>
>All you need is some clever software... which, as far as I know, does not
>exist yet. But it CAN be done, and WILL be done. Articulate Systems Inc.'s
>VOICE LINK(tm) digitizer product will eventually include software with this
>capability. For more information, write and ask for product literature.

The recently produced SID package contains a test program which does exactly
this: double-buffered recording to disk. I've used that with my MacRecorder
and it works. However, the SE isn't quite fast enough and so it misses a
few samples whenever the buffer is switched. I've talked to the author 
(couldn't remember the name offhand) and he says that he is aware of this.
The solution for the while: record using a faster machine.

>| Same as it ever was  | Dan Schwarz, MB 2926 Brandeis U. | RECYCLE YOUR JUNK|
>| Same as it ever was  | I'NET dan@chaos.cs.brandeis.edu  |------------------|
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>| Same as it ever was...TALKING HEADS "Once in a Lifetime"| FloydRushDeadEtc.|

George